水煤浆用木质素添加剂改性研究
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摘要
为解决木质素作为水煤浆添加剂时成浆浓度低和着火点高的缺点,本文以木质素磺酸钠(LS)为原料,确定制备木质素缩磺化萘(LCSN)、胺化木质素-聚苯乙烯-丙烯酸(PLSA)和胺化木质素-聚苯乙烯-马来酸酐(LPSM)等添加剂的最佳工艺。与LS1相比,LCSN分子量增大,无微小毛细物质,临界胶束浓度(CMC)下降0.0350mol/mL,亲水亲油值(HLB)减小0.5,对难成浆的褐煤成浆浓度提高4.1%,达到萘系分散剂的分散效果;与LS2相比,LPSA分子量增大,CMC下降0.0170mol/mL, HLB下降1.49,对易成浆的贫煤和焦煤成浆浓度提高3.0%;用LPSA制备的水煤浆的着火点比原煤,LS和蔡系分散剂等分别降低约13.31℃、7.43℃和13.61℃。表明改性的木质素可用于水煤浆添加剂,对于造纸废液资源的利用和水煤浆成本的降低具有重要意义。
When used as an additive to coal water slurry (CWS), lignin has the shortcomings of low concentration and high ignition point. To solve these problems, in this article, lignin sodium was used as a raw material to find out the optimum process to make additives, such as aminated lignin condensated sulfonated naphthalene (LCSN), aminated lignin-polystyrene-acrylic (LPSA) and aminatd lignin-polystyrene-maleic anhydride (LPSM). Compared with raw material, LCSN had increased Mn, no capillary substance. Its critical micelle concentration(CMC) decreased by0.035mol/ML, and hydrophile-lyophile balance (HLB) by0.5.When using the same dosage, compared with raw material, concentration of lignite CWS used LCSN as an additive increased by4.1%,which reached the same concentration of CWS as Naphthalene dispersants. Compared with raw lignin, M,, of LPSA was increased. CMC and HLB of LPSA reduced by0.0170mol/mL and1.49respectively. The concentration of lean coal and coke CWS of LPSA as additive was increased by3.0%. Compared with the ignition point of raw coal, CWS of material and CWS of naphthalene dispersants, that of CWS of LPSA as additive reduced13.31℃,7.43℃and13.61℃respectively. Predictably, the modified lignin not only made full use of resources, but also reduced the cost of coal water slurry additive.
引文
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